\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Utilization outcomes -- All treatment arms}
\begin{tabular}{l*{4}{c}}
\toprule
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}\\
                    &\multicolumn{1}{c}{\textbf{\begin{tabular}[c]{@{}c@{}}Utilization\\index\end{tabular}}}&\multicolumn{1}{c}{\begin{tabular}[c]{@{}c@{}}Vaccination rates,\\children\textless 36 months\end{tabular}}&\multicolumn{1}{c}{\begin{tabular}[c]{@{}c@{}}\% of visits to HC,\\vs. other providers\end{tabular}}&\multicolumn{1}{c}{\begin{tabular}[c]{@{}c@{}}Number of visits\\ to HC\end{tabular}}\\
\midrule
Full treatment      &       0.027   &       0.048   &       0.036   &      -0.002   \\
                    &     (0.022)   &     (0.036)   &     (0.033)   &     (0.027)   \\
Information and mobilization only&       0.012   &       0.026   &       0.023   &      -0.004   \\
                    &     (0.022)   &     (0.034)   &     (0.032)   &     (0.029)   \\
Interface only      &       0.053** &       0.049   &       0.072** &       0.038   \\
                    &     (0.022)   &     (0.034)   &     (0.033)   &     (0.027)   \\
Constant            &      -0.018   &      -0.008   &       0.003   &      -0.016   \\
                    &     (0.015)   &     (0.025)   &     (0.022)   &     (0.020)   \\
\midrule
N                   &      14,609   &       8,548   &      14,609   &      14,609   \\
R$^{2}$             &       0.221   &       0.045   &       0.173   &       0.273   \\
P-value (Information and mobilization = Interface)&       0.062   &       0.485   &       0.148   &       0.133   \\
P-value (Information and mobilization = Full treatment)&       0.494   &       0.520   &       0.703   &       0.934   \\
P-value (Interface = Full treatment)&       0.238   &       0.979   &       0.298   &       0.124   \\
\hline              &               &               &               &               \\
F-test (joint significance of all 3 treatment groups)&       2.196   &       0.859   &       1.587   &       1.147   \\
P-value (joint significance of all 3 treatment groups)&       0.088   &       0.463   &       0.192   &       0.330   \\
\bottomrule
\end{tabular}
\end{table}
